p-dropdown: Filtering all items incorrectly clears the dropdown's selected value

[rosenthalj]

Describe the bug

For a p-dropdown that is configured with a filter, when a user filters all option values, the selected dropdown item is also incorrectly cleared

The video listed below demonstrates the issue. In the video, only the filter is changed but the dropdown's selected value automatically changes between the"actual" selected value and an empty value

DropdownFilterBug.mov

Environment

windows and macos

Reproducer

https://stackblitz.com/edit/vr5hjz-6e41od

Angular version

17.x

PrimeNG version

17.3.3

Build / Runtime

Angular CLI App

Language

TypeScript

Node version (for AoT issues node --version)

18.18.1

Browser(s)

safari, chrome, firefox

Steps to reproduce the behavior

1. Run the reproducer: https://stackblitz.com/edit/vr5hjz-6e41od
2. Click on the dropdown
   -- The dropdown option item list is displayed with a filter field (good)
3. Enter "XX" in the dropdown filter field
   -- The dropdown selected item is automatically cleared (bad)
4. Click outside the dropdown
   -- The dropdown option item list is not displayed (good)
   -- The dropdown selected item is still cleared (bad)

Expected behavior

For all steps, the dropdown selected item should not be empty and should be "France"